A conventional wind vane/anemometer features mechanical rotating
parts. These moving parts expose the sensor to failure. The
ultrasonic sensor has been designed to avoid any mechanical part to
ensure the best possible and most reliable operation. The sonic
wind–vane/anemometers shows very stable results over the long term
and without maintenance.

The sound (and ultrasound) is conveyed by the movement of the fluid
in which it crosses. The electro acoustic transducers (1)
communicate between themselves two by two using ultrasonic signals
(2) to determine, following the orthogonal axes, the wave transit
time differences induced by the air flow (3). CV7 Transducers
communicate between themselves delivering four independent
measures, while head wind measured vectors are preferably used for
calculations. The measurements are combined in an integrated
calculation to establish the wind speed and its direction in
relation to a reference axis. The temperature measurements are used
for calibration corrections. The sensor’s design minimises the
effect of heel angle (4) (the effect of an inclination of the wind
sensor is partially corrected due to the shape given by the space).

The CV7 range of products features lateral transducers delivering
four independent measurements. The validity checks are used to
measure head wind vectors for calculations. This method gives a
wind speed sensitivity of 0.15 m/s, and reliability and excellent
linearity up to 40 m/s.*